Incoming mail for mail.jcaa.com is handled by one mailserver at com. mail.jcaa.com has one IP number , which is the same as for jcaa.com, but the reverse is localhost. jcaa.com point to the same IP and also shares mailservers. ns4.de, umcn.nl, sunx.org, cabi.net, celox.nl and at least 100 other hosts point to the same IP. jcaa.com is delegated to two nameservers, however one extra nameserver is listed in the zone. All nameservers are at paetec.net. All of them are on different IP networks. Incoming mail for jcaa.com is handled by one mailserver also at com.